| Message ID | 20231130094656.894412-1-lishifeng@sangfor.com.cn (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | net/mlx5e: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list() | expand |
On Thu, Nov 30, 2023 at 01:46:56AM -0800, Shifeng Li wrote: > Out_sz that the size of out buffer is calculated using query_nic_vport > _context_in structure when driver query the MAC list. However query_nic > _vport_context_in structure is smaller than query_nic_vport_context_out. > When allowed_list_size is greater than 96, calling ether_addr_copy() will > trigger an slab-out-of-bounds. > > [ 1170.055866] BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] > [ 1170.055869] Read of size 4 at addr ffff88bdbc57d912 by task kworker/u128:1/461 > [ 1170.055870] > [ 1170.055932] Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core] > [ 1170.055936] Call Trace: > [ 1170.055949] dump_stack+0x8b/0xbb > [ 1170.055958] print_address_description+0x6a/0x270 > [ 1170.055961] kasan_report+0x179/0x2c0 > [ 1170.056061] mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] > [ 1170.056162] esw_update_vport_addr_list+0x2c5/0xcd0 [mlx5_core] > [ 1170.056257] esw_vport_change_handle_locked+0xd08/0x1a20 [mlx5_core] > [ 1170.056377] esw_vport_change_handler+0x6b/0x90 [mlx5_core] > [ 1170.056381] process_one_work+0x65f/0x12d0 > [ 1170.056383] worker_thread+0x87/0xb50 > [ 1170.056390] kthread+0x2e9/0x3a0 > [ 1170.056394] ret_from_fork+0x1f/0x40 > > Fixes: e16aea2744ab ("net/mlx5: Introduce access functions to modify/query vport mac lists") > Cc: Ding Hui <dinghui@sangfor.com.cn> > Signed-off-by: Shifeng Li <lishifeng@sangfor.com.cn> Hi, I am unsure how you calculated the 96 figure above. But in any case I agree that the cited patch introduced the mismatch that you describe. Reviewed-by: Simon Horman <horms@kernel.org>
On 2023/12/4 1:50, Simon Horman wrote: > On Thu, Nov 30, 2023 at 01:46:56AM -0800, Shifeng Li wrote: >> Out_sz that the size of out buffer is calculated using query_nic_vport >> _context_in structure when driver query the MAC list. However query_nic >> _vport_context_in structure is smaller than query_nic_vport_context_out. >> When allowed_list_size is greater than 96, calling ether_addr_copy() will >> trigger an slab-out-of-bounds. >> >> [ 1170.055866] BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] >> [ 1170.055869] Read of size 4 at addr ffff88bdbc57d912 by task kworker/u128:1/461 >> [ 1170.055870] >> [ 1170.055932] Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core] >> [ 1170.055936] Call Trace: >> [ 1170.055949] dump_stack+0x8b/0xbb >> [ 1170.055958] print_address_description+0x6a/0x270 >> [ 1170.055961] kasan_report+0x179/0x2c0 >> [ 1170.056061] mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] >> [ 1170.056162] esw_update_vport_addr_list+0x2c5/0xcd0 [mlx5_core] >> [ 1170.056257] esw_vport_change_handle_locked+0xd08/0x1a20 [mlx5_core] >> [ 1170.056377] esw_vport_change_handler+0x6b/0x90 [mlx5_core] >> [ 1170.056381] process_one_work+0x65f/0x12d0 >> [ 1170.056383] worker_thread+0x87/0xb50 >> [ 1170.056390] kthread+0x2e9/0x3a0 >> [ 1170.056394] ret_from_fork+0x1f/0x40 >> >> Fixes: e16aea2744ab ("net/mlx5: Introduce access functions to modify/query vport mac lists") >> Cc: Ding Hui <dinghui@sangfor.com.cn> >> Signed-off-by: Shifeng Li <lishifeng@sangfor.com.cn> > > Hi, > > I am unsure how you calculated the 96 figure above. > But in any case I agree that the cited patch introduced > the mismatch that you describe. > out_sz = MLX5_ST_SZ_BYTES(query_nic_vport_context_in) + req_list_size * MLX5_ST_SZ_BYTES(mac_address_layout) = 0x80/8 + 128 * 0x40/8 = 0x410 (bytes) nic_vport_ctx = MLX5_ADDR_OF(query_nic_vport_context_out, out, nic_vport_context) = 0x880/8 = 0x110 (bytes) mac_addr = MLX5_ADDR_OF(nic_vport_context, nic_vport_ctx, current_uc_mac_address[96]) + 2 = 0x110 + 96 * 8 + 2 = 0x412 (bytes) When i is 96, the mac_addr offset is 0x412 but the out_sz is 0x410. And that will trigger an slab-out-of-bounds. Thanks. > Reviewed-by: Simon Horman <horms@kernel.org>
On Mon, Dec 04, 2023 at 10:30:14AM +0800, Shifeng Li wrote: > On 2023/12/4 1:50, Simon Horman wrote: > > On Thu, Nov 30, 2023 at 01:46:56AM -0800, Shifeng Li wrote: > > > Out_sz that the size of out buffer is calculated using query_nic_vport > > > _context_in structure when driver query the MAC list. However query_nic > > > _vport_context_in structure is smaller than query_nic_vport_context_out. > > > When allowed_list_size is greater than 96, calling ether_addr_copy() will > > > trigger an slab-out-of-bounds. > > > > > > [ 1170.055866] BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] > > > [ 1170.055869] Read of size 4 at addr ffff88bdbc57d912 by task kworker/u128:1/461 > > > [ 1170.055870] > > > [ 1170.055932] Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core] > > > [ 1170.055936] Call Trace: > > > [ 1170.055949] dump_stack+0x8b/0xbb > > > [ 1170.055958] print_address_description+0x6a/0x270 > > > [ 1170.055961] kasan_report+0x179/0x2c0 > > > [ 1170.056061] mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] > > > [ 1170.056162] esw_update_vport_addr_list+0x2c5/0xcd0 [mlx5_core] > > > [ 1170.056257] esw_vport_change_handle_locked+0xd08/0x1a20 [mlx5_core] > > > [ 1170.056377] esw_vport_change_handler+0x6b/0x90 [mlx5_core] > > > [ 1170.056381] process_one_work+0x65f/0x12d0 > > > [ 1170.056383] worker_thread+0x87/0xb50 > > > [ 1170.056390] kthread+0x2e9/0x3a0 > > > [ 1170.056394] ret_from_fork+0x1f/0x40 > > > > > > Fixes: e16aea2744ab ("net/mlx5: Introduce access functions to modify/query vport mac lists") > > > Cc: Ding Hui <dinghui@sangfor.com.cn> > > > Signed-off-by: Shifeng Li <lishifeng@sangfor.com.cn> > > > > Hi, > > > > I am unsure how you calculated the 96 figure above. > > But in any case I agree that the cited patch introduced > > the mismatch that you describe. > > > out_sz = MLX5_ST_SZ_BYTES(query_nic_vport_context_in) + req_list_size * MLX5_ST_SZ_BYTES(mac_address_layout) > = 0x80/8 + 128 * 0x40/8 = 0x410 (bytes) > > nic_vport_ctx = MLX5_ADDR_OF(query_nic_vport_context_out, out, nic_vport_context) > = 0x880/8 = 0x110 (bytes) > mac_addr = MLX5_ADDR_OF(nic_vport_context, nic_vport_ctx, current_uc_mac_address[96]) + 2 > = 0x110 + 96 * 8 + 2 > = 0x412 (bytes) > > When i is 96, the mac_addr offset is 0x412 but the out_sz is 0x410. > And that will trigger an slab-out-of-bounds. Thanks for the clarification, this looks good to me. > > Reviewed-by: Simon Horman <horms@kernel.org>
On 30 Nov 01:46, Shifeng Li wrote: >Out_sz that the size of out buffer is calculated using query_nic_vport >_context_in structure when driver query the MAC list. However query_nic >_vport_context_in structure is smaller than query_nic_vport_context_out. >When allowed_list_size is greater than 96, calling ether_addr_copy() will >trigger an slab-out-of-bounds. > >[ 1170.055866] BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] >[ 1170.055869] Read of size 4 at addr ffff88bdbc57d912 by task kworker/u128:1/461 >[ 1170.055870] >[ 1170.055932] Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core] >[ 1170.055936] Call Trace: >[ 1170.055949] dump_stack+0x8b/0xbb >[ 1170.055958] print_address_description+0x6a/0x270 >[ 1170.055961] kasan_report+0x179/0x2c0 >[ 1170.056061] mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] >[ 1170.056162] esw_update_vport_addr_list+0x2c5/0xcd0 [mlx5_core] >[ 1170.056257] esw_vport_change_handle_locked+0xd08/0x1a20 [mlx5_core] >[ 1170.056377] esw_vport_change_handler+0x6b/0x90 [mlx5_core] >[ 1170.056381] process_one_work+0x65f/0x12d0 >[ 1170.056383] worker_thread+0x87/0xb50 >[ 1170.056390] kthread+0x2e9/0x3a0 >[ 1170.056394] ret_from_fork+0x1f/0x40 > >Fixes: e16aea2744ab ("net/mlx5: Introduce access functions to modify/query vport mac lists") >Cc: Ding Hui <dinghui@sangfor.com.cn> >Signed-off-by: Shifeng Li <lishifeng@sangfor.com.cn> Applied to net-mlx5. Thanks, Saeed.
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vport.c b/drivers/net/ethernet/mellanox/mlx5/core/vport.c index 5a31fb47ffa5..21753f327868 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/vport.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/vport.c @@ -277,7 +277,7 @@ int mlx5_query_nic_vport_mac_list(struct mlx5_core_dev *dev, req_list_size = max_list_size; } - out_sz = MLX5_ST_SZ_BYTES(query_nic_vport_context_in) + + out_sz = MLX5_ST_SZ_BYTES(query_nic_vport_context_out) + req_list_size * MLX5_ST_SZ_BYTES(mac_address_layout); out = kvzalloc(out_sz, GFP_KERNEL);
Out_sz that the size of out buffer is calculated using query_nic_vport _context_in structure when driver query the MAC list. However query_nic _vport_context_in structure is smaller than query_nic_vport_context_out. When allowed_list_size is greater than 96, calling ether_addr_copy() will trigger an slab-out-of-bounds. [ 1170.055866] BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] [ 1170.055869] Read of size 4 at addr ffff88bdbc57d912 by task kworker/u128:1/461 [ 1170.055870] [ 1170.055932] Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core] [ 1170.055936] Call Trace: [ 1170.055949] dump_stack+0x8b/0xbb [ 1170.055958] print_address_description+0x6a/0x270 [ 1170.055961] kasan_report+0x179/0x2c0 [ 1170.056061] mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core] [ 1170.056162] esw_update_vport_addr_list+0x2c5/0xcd0 [mlx5_core] [ 1170.056257] esw_vport_change_handle_locked+0xd08/0x1a20 [mlx5_core] [ 1170.056377] esw_vport_change_handler+0x6b/0x90 [mlx5_core] [ 1170.056381] process_one_work+0x65f/0x12d0 [ 1170.056383] worker_thread+0x87/0xb50 [ 1170.056390] kthread+0x2e9/0x3a0 [ 1170.056394] ret_from_fork+0x1f/0x40 Fixes: e16aea2744ab ("net/mlx5: Introduce access functions to modify/query vport mac lists") Cc: Ding Hui <dinghui@sangfor.com.cn> Signed-off-by: Shifeng Li <lishifeng@sangfor.com.cn> --- drivers/net/ethernet/mellanox/mlx5/core/vport.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)